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    <h1>Documentation</h1>
    <h3>Kafka 4.0 Documentation</h3>
    Prior releases: <a href="/07/documentation.html">0.7.x</a>, 
                    <a href="/08/documentation.html">0.8.0</a>, 
                    <a href="/081/documentation.html">0.8.1.X</a>, 
                    <a href="/082/documentation.html">0.8.2.X</a>, 
                    <a href="/090/documentation.html">0.9.0.X</a>, 
                    <a href="/0100/documentation.html">0.10.0.X</a>, 
                    <a href="/0101/documentation.html">0.10.1.X</a>, 
                    <a href="/0102/documentation.html">0.10.2.X</a>, 
                    <a href="/0110/documentation.html">0.11.0.X</a>, 
                    <a href="/10/documentation.html">1.0.X</a>, 
                    <a href="/11/documentation.html">1.1.X</a>, 
                    <a href="/20/documentation.html">2.0.X</a>, 
                    <a href="/21/documentation.html">2.1.X</a>, 
                    <a href="/22/documentation.html">2.2.X</a>, 
                    <a href="/23/documentation.html">2.3.X</a>, 
                    <a href="/24/documentation.html">2.4.X</a>, 
                    <a href="/25/documentation.html">2.5.X</a>, 
                    <a href="/26/documentation.html">2.6.X</a>, 
                    <a href="/27/documentation.html">2.7.X</a>,
                    <a href="/28/documentation.html">2.8.X</a>,
                    <a href="/30/documentation.html">3.0.X</a>,
                    <a href="/31/documentation.html">3.1.X</a>,
                    <a href="/32/documentation.html">3.2.X</a>,
                    <a href="/33/documentation.html">3.3.X</a>,
                    <a href="/34/documentation.html">3.4.X</a>,
                    <a href="/35/documentation.html">3.5.X</a>,
                    <a href="/36/documentation.html">3.6.X</a>,
                    <a href="/37/documentation.html">3.7.X</a>,
                    <a href="/38/documentation.html">3.8.X</a>,
                    <a href="/39/documentation.html">3.9.X</a>.

   <h2 class="anchor-heading"><a id="gettingStarted" class="anchor-link"></a><a href="#gettingStarted">1. Getting Started</a></h2>
      <h3 class="anchor-heading"><a id="introduction" class="anchor-link"></a><a href="#introduction">1.1 Introduction</a></h3>
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      <h3 class="anchor-heading"><a id="uses" class="anchor-link"></a><a href="#uses">1.2 Use Cases</a></h3>
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      <h3 class="anchor-heading"><a id="quickstart" class="anchor-link"></a><a href="#quickstart">1.3 Quick Start</a></h3>
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      <h3 class="anchor-heading"><a id="ecosystem" class="anchor-link"></a><a href="#ecosystem">1.4 Ecosystem</a></h3>
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      <h3 class="anchor-heading"><a id="upgrade" class="anchor-link"></a><a href="#upgrade">1.5 Upgrading From Previous Versions</a></h3>
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      <h3 class="anchor-heading"><a id="zk2kraft-summary" class="anchor-link"></a><a href="#zk2kraft-summary">1.6 KRaft vs ZooKeeper</a></h3>
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      <h3 class="anchor-heading"><a id="compatibility-summary" class="anchor-link"></a><a href="#compatibility-summary">1.7 Compatibility</a></h3>
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      <h3 class="anchor-heading"><a id="docker" class="anchor-link"></a><a href="#docker">1.8 Docker</a></h3>
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    <h2 class="anchor-heading"><a id="api" class="anchor-link"></a><a href="#api">2. APIs</a></h2>

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    <h2 class="anchor-heading"><a id="configuration" class="anchor-link"></a><a href="#configuration">3. Configuration</a></h2>

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    <h2 class="anchor-heading"><a id="design" class="anchor-link"></a><a href="#design">4. Design</a></h2>

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    <h2 class="anchor-heading"><a id="implementation" class="anchor-link"></a><a href="#implementation">5. Implementation</a></h2>

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    <h2 class="anchor-heading"><a id="operations" class="anchor-link"></a><a href="#operations">6. Operations</a></h2>

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    <h2 class="anchor-heading"><a id="security" class="anchor-link"></a><a href="#security">7. Security</a></h2>
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    <h2 class="anchor-heading"><a id="connect" class="anchor-link"></a><a href="#connect">8. Kafka Connect</a></h2>
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    <h2><a id="streams" href="#streams">9. Kafka Streams</a></h2>
    <p>
        Kafka Streams is a client library for processing and analyzing data stored in Kafka. It builds upon important stream processing concepts such as properly distinguishing between event time and processing time, windowing support, exactly-once processing semantics and simple yet efficient management of application state.
    </p>
    <p>
        Kafka Streams has a <b>low barrier to entry</b>: You can quickly write and run a small-scale proof-of-concept on a single machine; and you only need to run additional instances of your application on multiple machines to scale up to high-volume production workloads. Kafka Streams transparently handles the load balancing of multiple instances of the same application by leveraging Kafka's parallelism model.
    </p>

    <p>To learn more about Kafka Streams, visit the <a href="/documentation/streams">Kafka Streams page</a>.</p>

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